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it's because your hair loses it protein to longer it gets.. a trim every 4-6 weeks is essential, as is keeping up on it with a good protein pack as well.
It's thinner because of breakage at the ends.

I hate to put it this way.. but your hair is damaged.. at this point it's best to take off about 3-4 inches, and keep up with it from there. the longer you take to not trim it, the chances are you'll have more split ends.. split ends can travel up the hair shaft causing other damage to the hair.. knots, making it brittle, and finally breakage.
So go to the salon every 4-6 weeks.. get a trim and a protein treatment. and get some good shampoo's and conditioners.. professional brands contain things that need to go back into the hair, especially with hair that long. Things like protein, keratin, etc that brands like suave and pantene DO NOT HAVE